(i) One variety of household fuel is a mixture of propane (60%) and butane (40%). If 20 litres of this mixture is burnt, find the total volume of carbon dioxide added to the atmosphere. The combination reactions can be represented as:
C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O
2C₄H₁₀ + 13O₂ --> 8CO₂ + 10H₂O
(ii) Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively. Which solution.
(a) will liberate sulphur dioxide gas when heated with sodium sulphite
(b) will liberate ammonia gas when reacted with ammonium chloride
(c) will not have any effect on litmus paper?
(iii) 8.2 grams of calcium nitrate is decomposed by heating according to the equation
2Ca (NO₃)₂ --> 2CaO +4NO₂ + O₂
Calculate the following:
(a) Volume of nitrogen dioxide obtained at STP
(b) Mass of CaO formed
[Atomic weights: Ca—40 , N—14, O—16]

Solution

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